Messages

1

General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: June 10, 2011, 01:24:47 AM »

latest sample cuts from last night after running the auto servo tuning. Still not 100% but a cr@p-load better IMHO.

2

General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: June 09, 2011, 03:07:32 PM »

Damn, I wanted to tell them it's better!!!>:/ Grrrr!!

3

General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: June 09, 2011, 10:00:04 AM »

If you look at the error on the corner, it must be going to far rather than a under run? So if we want to make it closer to a under run how will we go about doing so?

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General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: June 09, 2011, 08:50:04 AM »

DOes it do this on EVERY small sharp corner?  IF so then LOOK to the servo tuning, too much overrun will do it every time. The servo will overun the position and then back up to correct.

Just a thought, (;-) TP

BT5000, Do you think the over run is on the x or y or Z? or a combination of 2 or all 3? We all geared up to start fiddling with the settings now>

5

General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: June 09, 2011, 08:17:11 AM »

One more thing, the Z axis sometimes moves DOWN instead of up when we hit zero all axis, now come the hell on, what the hell man!?!? I can't baby the damn machine ahole day, if I punch in a command I expect it to follow it now only follow it some times?!?! how can a person work like that?

oh, before I forget, the Spindle only start up 75% time.

These sound like hardware troubles. What comes to mind is bad connections on the DIRECTION signal to the Z drive and spindle forward.

Does the DRO for the Z axis confirm the spindle is going down instead of up when you hit REF ALL HOME? I am assuming you mean REF ALL HOME since ZERO ALL AXIS should cause no moment.

Darek

Hi Derek, you were right about the Spindle, it was a connection error, but now we are facing a new challenge, it don't want to start up if it's below or at 8000 rpm, any ideas why that would be?

6

General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: June 03, 2011, 04:46:35 AM »

I found out ours also have a oscilloscope build it, they double checked it and made all axis 10% "stiffer" to prevent possible back-lash - but it did not make any difference at all:/ They might have figured out why the spindle only starts up 75% of the time, say it might be a wiring problem, so will re-wire it. Going to reinforce the Z with a thinker back plate if the problem is coming from that side and then retest again on Monday:)

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General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: May 30, 2011, 10:16:09 AM »

http://www.cnccookbook.com/CCServoTuning.htm -  this Guy says under how the "Pro's" do it section: " OK, now let's see how the other half lives, the "pro" half, because they often use better means of tuning than ear. Many pro-quality motion controllers and servo drives have a tuning display built right in that shows graphs like what I've shown. Some even have a self-tuning mode so you never need to tune manually. " - I think he have the self-tuning one possibly?

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General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: May 30, 2011, 01:27:58 AM »

How do you fix the Servo tuning?? Can we do that ourselves or will it be best sort out by the manufacturer?

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General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: May 29, 2011, 06:27:34 AM »

The faster we go the more it messed up the corner sharping and the slower the go the better the results.

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General Mach Discussion / Re: Mach3 Problems - Rant!!

« on: May 29, 2011, 06:23:27 AM »

I think we have a backlash problem, what the best way to sort it out??? The X-Y ballscrews are about 1m long and the Z is not long at all, about 200mm..